/*
 * Copyright (c) 2008-2011, Piccolo2D project, http://piccolo2d.org
 * Copyright (c) 1998-2008, University of Maryland
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions
 * and the following disclaimer in the documentation and/or other materials provided with the
 * distribution.
 *
 * None of the name of the University of Maryland, the name of the Piccolo2D project, or the names of its
 * contributors may be used to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package edu.umd.cs.piccolox.handles;

import edu.umd.cs.piccolo.PCamera;
import edu.umd.cs.piccolo.PNode;
import edu.umd.cs.piccolo.util.PBounds;
import edu.umd.cs.piccolo.util.PPickPath;

/**
 * This class relays adjustments to its bounds to its target.
 */
public class PStickyHandleManager extends PNode {
    private static final long serialVersionUID = 1L;
    private PNode target;
    private PCamera camera;

    /**
     * Constructs a sticky handle manager responsible for updating the position
     * of its associated node on the camera provided.
     * 
     * @param newCamera camera on which this manager is operating
     * @param newTarget node to be positioned on the camera
     */
    public PStickyHandleManager(final PCamera newCamera, final PNode newTarget) {
        setCameraTarget(newCamera, newTarget);
        PBoundsHandle.addBoundsHandlesTo(this);
    }

    /**
     * Changes the node and camera on which this manager is operating.
     * 
     * @param newCamera camera on which this manager is operating
     * @param newTarget node to be positioned on the camera
     */
    public void setCameraTarget(final PCamera newCamera, final PNode newTarget) {
        camera = newCamera;
        camera.addChild(this);
        target = newTarget;
    }

    /**
     * By changing this sticky handle's bounds, it propagates that change to its
     * associated node.
     * 
     * @param x x position of bounds
     * @param y y position of bounds
     * @param width width to apply to the bounds
     * @param height height to apply to the bounds
     * 
     * @return true if bounds were successfully changed
     */
    public boolean setBounds(final double x, final double y, final double width, final double height) {
        final PBounds b = new PBounds(x, y, width, height);
        camera.localToGlobal(b);
        camera.localToView(b);
        target.globalToLocal(b);
        target.setBounds(b);
        return super.setBounds(x, y, width, height);
    }

    /**
     * Since this node's bounds are always dependent on its target, it is
     * volatile.
     * 
     * @return true since sticky handle manager's bounds are completely
     *         dependent on its children
     */
    protected boolean getBoundsVolatile() {
        return true;
    }

    /**
     * The sticky handle manager's bounds as computed by examining its target
     * through its camera.
     * 
     * @return the sticky handle manager's bounds as computed by examining its
     *         target through its camera
     */
    public PBounds getBoundsReference() {
        final PBounds targetBounds = target.getFullBounds();
        camera.viewToLocal(targetBounds);
        camera.globalToLocal(targetBounds);
        final PBounds bounds = super.getBoundsReference();
        bounds.setRect(targetBounds);
        return super.getBoundsReference();
    }

    /**
     * Dispatches this event to its target as well.
     */
    public void startResizeBounds() {
        super.startResizeBounds();
        target.startResizeBounds();
    }

    /**
     * Dispatches this event to its target as well.
     */
    public void endResizeBounds() {
        super.endResizeBounds();
        target.endResizeBounds();
    }

    /**
     * Since this node is invisible, it doesn't make sense to have it be
     * pickable.
     * 
     * @return false since it's invisible
     * @param pickPath path in which we're trying to determine if this node is
     *            pickable
     */
    public boolean pickAfterChildren(final PPickPath pickPath) {
        return false;
    }
}